.. _method-nl2sol-false_conv_tol:

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false_conv_tol
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False convergence tolerance


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**Specification**

- *Alias:* None

- *Arguments:* REAL

- *Default:* -1. (use NL2SOL internal default)


**Description**


``false_conv_tol`` (NL2SOL's ``xftol``) is the
false-convergence tolerance (stop with a suspicion of discontinuity
when a more favorable stopping test is not satisfied and a step of
scaled length at most ``false_conv_tol`` is not accepted)

The internal default is a function of machine epsilon
(as limited by ``function_precision``). The default is selected with a value of -1.